Season 1

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  7.2/10681 votes

  Once There Was a Flood

  Season 1 Episode 1 - Aired 11/11/2022

  Graham visits Gunung Padang, an Indonesian archeological site, to find proof of a lost civilization — and the potential cataclysm that wiped it out.

  Director: Unknown

  Writer: Unknown

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  7.1/10572 votes

  Stranger in a Time of Chaos

  Season 1 Episode 2 - Aired 11/11/2022

  In Cholula, Mexico's oldest continuously-inhabited city, the journalist inspects the world's largest pyramid for signs of a forgotten past.

  Director: Unknown

  Writer: Unknown

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  7.5/10519 votes

  Sirius Rising

  Season 1 Episode 3 - Aired 11/11/2022

  Graham discovers a fascinating pattern that may connect the spectacular megalithic temples of Malta, which he believes to be much older than reported.

  Director: Unknown

  Writer: Unknown

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  7.3/10484 votes

  Ghosts of a Drowned World

  Season 1 Episode 4 - Aired 11/11/2022

  Few scholars have investigated the Bimini rock formation off the coast of Miami, once fabled to be the road to Atlantis — but Graham dives right in.

  Director: Unknown

  Writer: Unknown

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  7.6/10495 votes

  Legacy of the Sages

  Season 1 Episode 5 - Aired 11/11/2022

  At Göbekli Tepe, the oldest known megalith in the world, Graham questions if simple hunter-gatherers alone could have built such an advanced structure.

  Director: Unknown

  Writer: Unknown

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  7.3/10454 votes

  America's Lost Civilization

  Season 1 Episode 6 - Aired 11/11/2022

  Graham visits ancient mounds in North America and wonders if they contain astronomical significance — or even warnings of an apocalyptic climate event.

  Director: Unknown

  Writer: Unknown

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  7.6/10454 votes

  A Fatal Winter

  Season 1 Episode 7 - Aired 11/11/2022

  The author returns to Turkey to explore Derinkuyu, an ancient underground city and survival bunker that could shelter thousands in times of crisis.

  Director: Unknown

  Writer: Unknown

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  7.5/10460 votes

  Cataclysm and Rebirth

  Season 1 Episode 8 - Aired 11/11/2022

  In the ancient geological sites of North America, Graham envisions an apocalyptic event that may have changed the Earth — and its inhabitants — forever.

  Director: Marc Tiley

  Writer: Unknown